A Time-varying Modal Parameter Recursive Estimation Method Based on FS-TARMA Model for Missile and Rocket

doi:10.3969/j.issn.1000-1093.2020.11.005

Abstract

Abstract: With the development of missile and rocket system towards large-scale, high-speed and intelligent, the influence of dynamic characteristics on the overall structure cannot be ignored. The problem of time-varying modal parameter estimation for missile and rocket duing operation is studied. A novel time-varying modal parameter recursive estimation method is proposed based on functional series time-dependent autoregressive moving-average (FS-TARMA) model. The proposed method uses wavelet function as the basis function of time-varying parameters in TARMA model, and the projection of parameter matrix is recursively estimated as it is treated as a variable of the length of vibration response data by using the recursive manner of unstructured TARMA model. The proposed method is validated by the core stage of Ariane V time-varying finite element model. The verification results demonstrate that the proposed recursive method has nearly same identification accuracy compared with batch estimation method, with the relative RSS error in three-order modal frequency being within 5%, and has superior computation efficiency as the computation time is shorten to 1/9.

Key words: missileandrocket, time-varyingstructure, modalparameteridentification, recursiveestimation, functionalseriestime-dependentautoregressivemoving-averagemodel

CLC Number:

TJ011⁺.2

YU Lei， ZHANG Yongli， YUAN Mengdi， LIU Ruiqing. A Time-varying Modal Parameter Recursive Estimation Method Based on FS-TARMA Model for Missile and Rocket[J]. Acta Armamentarii, 2020, 41(11): 2189-2197.

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